Double row antifriction bearing



AP'I 27, .1948 E. K. BROWN 2,440,435

DOUBLE ROW ANTIFRICTION BEARING `Fi 1ed"sept. e, 194'5 2 sheets-sheet 1Ima/mmm MM Jg QM,

E. K. BROWN DOUBLE ROW ANTIFRICTION BEARING Filed Sept. 6, 1945 April27, 1948.

2 swamsheet 2 Patented Apr. 27% 1948 PATIENT @Fil-TICE f24440l435 A:UOUBLERoWnNTIFRICTIoN BEARING i .iEhnu'd 2K. fBnown, `1lorrington,wilcnn., 'zssgnor 4 to mhenrringtomompany, Torrington,-0onn., lgacorpcrationtof Connecticut Mpueaumiseptemuer 6,1ers,--se'isl'fr-m.'feintt9` =In employing Santiri'ctlon bearings,.itlisidesirable "to ldistribute fthe load-along Ithe'axisland'ftoassure the maintenance 'df rotation but'ithe selected axis. "Whensingle-row @bearings r`are used, there is very-pourresistance'-tdanexternal couple. Whenfroller 'bearings vfare iused, such"as 'needle bearings yivilich 'fha've 'fliigh length-todiameter ratios,the use of a single bearing'fo'reI pulley, gear, etc., :causes trouble:due "to 'fcc'rnerfloading of the rolls. -For eontinucus :successful'operation *of needle bearings, *the r'lls -fshoul'd `have `van unloadedzone; vrthatis, the -rdlls f at one `side o'f vthe rbearing "must `beTree v'for the Jentire length to-move and'reali'gn'theniselves "and'to"ob- Vtain 'this vcondition there can be no pressure 'rom the `cuterrace through 'the'roll tothe-inner Vrece Aat'this zone.

.a single row cylindrical "roller `bearing, of needle type for.example/is subjected "to an external couple load, Va relativeangular'movement between the `axes `.of the inner fand -outer `-racescauses the roll at one side oftheb`earing ito Sloe `loaded 'at one Vendand fthe roll 'at the-opposite ,-seiaims. (Giens- 213) Aside Atobeloaded atthe other end. This loady ing at the ends :causes skewing 'ofthe individual rolls; and the 'binding of the opltiositerolls 'preventsrealignment, so that 'the bearing jeither `'creates high endthrustWithiniitself or 4looks up. Hence, the'employmentoitwoaxially/spacedrows 'o'f rolls is advisable, 4sotliatan:external couple Will beresisted b-y"onebea`ring Yat 'one "end of the pulley; etc., and Vbythe-other bearingatithe 'other end, `thereby providing an 'unloadedvzone in each bearing.

In my Patents 2,038,474 and '2;U38;475"are .described cylindrical rollor needle bearing units Jcomposed -ofrollersand one-piece race cupshaving flanges for retaining the "'rdlls so "that V"the 'assemblies canbe *handledandiinstalle'd vas units. It is feasible tu employapairefsuch'unlts, but "for'quickand `accurateasseirfllydf"parts,itisdesirable `to have -`single-anilla l'ievides l A "feature of 'this"invention is u'the-*provision of =a single-unit 'structure "having Htwor'ows of y.

bearlng'rolls Another feature "is the provision "ofi e. -sii'ig'leunitstructure r`having two 'row's "dfbe'aring rdlls, together with includedinner rates 4arid outer races therefor, and, partition means forpreventrolls.

Otherfeatures will appearinthejcourse ''f `the `following descriptionVand 'claims :Figures-1 'showsacuprstruture #for providing anfouterrace. Y A Figure -AL'l'shows` the cup with Eits `lip'infru'stoc'orii'clfform.

r-Eig'ure 13 shows 'fa #cupi-'as in assembled therein.

:Figure"4showsfanzinnerfracemember. Figures 25mn-d i6 fshow the:operation `r-of seating thefeupfandiroll assemblyfof-fFigurefS lwith ian' in- :lrferrraceimemheraofiElgurei`4. :F.Figure 17 shows nfthe`assembly of 1a secondcup .fnd rroll'assembly foffEigure 3 Uwith thestructure fprodueedlasinllgure. :Figure f8 is a'fvi'ewhcwingthelccmpleted `idearfi'rfgfunit. i f Figure i1 showsacupwlilchfcanbe made in vari- Io'usrcnnventionetlfwaysby tu'lin'ing,spinning, draw- 4:lgligure 2 'with rolls ing Eand ificrniing I"in dies.'The cup il I KFigurf-e 1) tis thusicrm'ed 4with a tlii'rinedsectionl atits upper The cups, inner race members, and rolls are ened and polishedbefore' assembly. Y 'Y preferably formed of steel, and are then hard-The parts may be assembled by placing a cup I3 on its base (Figure 3)and inserting rolls 25 in number sumcient to fill the periphery with aslight spacing.

An inner race member 20 isl then introduced (Figure 5) until the reducedportion enters the"y aperture I5 and the adjacent shoulder on the innerrace member rests on the bottom iiangeA of the cup, while at the sametime forcing the frusto conical ange I2 into a plane form sovthat its`lip enters the groove 25, and therewith stressing the material beyondits elastic limit so that the engagement is maintained. A second outerrace member with rollers is then similarly positioned at the other endof the inner race. This can'be done by appropriate tools, such as. theillustrative conventionalized press-die structures shown in Figures 5, 6and 7. y .I

In Figure 5 the die shoe-supports a'locatedring 40 which closelyreceives the outerrace structure so that the latter restsrupon an anvil4I formed as a knockout and supported against downward movement by arest 42 shown as a part of the ring body. When the inner race member isintroduced, its lower shouldered surface rests of the conical ilange isbeing conducted in two steps, the eifective'lower surfaceof the ring 4'Iis a hollow cone having-an angle of about 20 degrees relative to theradial plane. Aligning means, i1- lustrated by the leaderV pins 48, ispreferably provided to assure accurate control during the operation. Theknocker 49 for ejecting the formed assembly serves to move theanvil orknockout Y4I upwardly when the upper punch 45 is withdrawn. f

An outer race assembly with its rolls or needles is inserted in ring4unti1it rests on the anvil 4| and the latter upon the rest 42; An innerrace is introduced until it .,rests on the outer race flange. The punchholder 45 is brought down, and the pressure ring 41 begins to pressthefrustum downwardly. The ring 40-prevents bulging deformation of thecylindrical part of the outerrace member during the operation ofpressing the frusto-conical portion downward toward a radial planeposition, wherewith its mouth diameter decreases, and the lip enters andinterlocks in the groove 23, This-pressing stresses the vmaterial beyondits elastic limit, so that it remains in'ths interlocked position. Theeffects are controlled by adjusting the positions occupied by the partsat the end of the press stroke, as by use of the shim or pad 46 with akpress having a fixed ram stroke. Then the upper punch-45,v is raisedagain, and the ejecting knocker 49 actuated to raise the partialassembly clear of the die, so that it can be removed. y l

The tools in Figures and 7 vhave the ring 40, anvil 4I, rest 42 andknocker. 4,9-'as inFigllre Y5.,

4 When the two outer races for each unit are of the same size, the samedie shoe structure can be employed in Figures 5, 6 and 7. The punchholder 45 of Figure 6 has a pressure punch 41a which has a plane lowerface. The punch holder 45 of Figure 7, however, has a recess of largersize than the punch of Figure 5 in order to receive thc'e'alre`adypositioned outer race member of the structure coming from Figure 5: inthe illustrative form a cap punch 56 bears upon this latter` outer race,and preferably upon the end of the inner race. In Figure 7, theessentially plane ang'e of the already-positioned outer race mem- -beris employed as the tool for forming the ange for the second outer racemember.

The-partial assembly from Figure 5 is introduced to the tool of Figure6, by inserting it in the ring 4U as before. The punch holder 45 isbrought down, so that the punch 41a engages the partially re-shapedconical frustuin, and presses this toplane form.` AThe metal is againlstrained beyondgthe elastic limit,so that the'- -upper flange remainsqset essentially as a plane, with a slight elastic return` or recoverywhich provides end clearance relative to lthe inner race: This effect iscontrolled by adjustment of the final position of the punch holder 45 bysuitable means such as theshim46. j Y- e A second outer race assemblywith its rolls or needles is introduced into the ring 40 of Figure 7 until it rests on the anvil 4 I. The partially-assembled unit from FigureGis inverted and its end introduced into the second outer race until.the two louter race structures abut. This positions the lip of thesecond outer race member in plane with the groove 23, The punch holder45 is brought down, and the frustum of the second outer` race issimilarly stressed beyond its elastic; vlimit, andcaused to enter thegroove 23 and interlock therewith. It'will be noted that thealreadyformed. angeof the first' outer race member is. ,being supportedat its inner periphery by engaging the shoulder wall of the groove 23.When the upper punch 56Y is, raised, the anges return. slightly andprovide the end clearance for thelrolls. This completes the assembly andprovides the unit as shown in Figure 8.

This unit has a solid inner race member and two individually movableouter race members spaced axially along the inner race so that theaforesaid troubles do not arise.

, It is obvious -that the illustrated form of pracltice is notrestrictive, and that the invention may `be utilized in other formswithin the scope of the `appended claims.

Iclaim:

. 1.1 A roller bearing structure comprising an inner racemember havingrace surfaces each terminated at its ends by an inward shoulder, theproximate shoulders'being spaced, a set of rolls lon each saidsurface;and two outer race members each surrounding one of said sets of rolls,each outer race. member having an integral flange extending inwardly forengaging the corresponding proximate shoulder and thereby preventingseparation of, the race members.

' 2. A rollerbearingunit comprising a one-piece inner race member'.`having two cylindrical race surfaces separated bya peripheral groove,two -sets of rolls with one of saidV sets positioned on each 'of saidcylindricalv race surfaces, and two individual outer race4 members; eachof said outer race members being-of one-piece construction and, havingacylindrical innerlsurface to coop- '-erate withga corresponding, one ofsaid sets of rolls, also having an end flange extending inwardly at oneend of the inner race for detaining the set of rolls against separation,and also having an end flange engaged in said peripheral groove; saidouter race members being rotatable about the inner race memberindependently of each other.

3. A roller bearing unit comprising a one-piece inner race member havingtwo cylindrical race surfaces separated by a peripheral groove, two setsof rolls, each `of said cylindrical race surfaces having a said set ofrolls thereon, and two individual outer race members, each surrounding acorresponding inner race surface and the set of rolls thereon; each ofsaid outer race members being a one-piece cup structure with acylindrical inner surface to cooperate with the corresponding one ofsaid sets of rolls, and with the bottom of the cup extending inwardly atone end of the inner race member for detaining the set of rolls againstseparation, and also having at REFERENCES CITED The following referencesare of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,176,170 Schatz Mar. 21, 19161,995,571 Lott Mar. 26, 1935 2,268,745 Frauenthal Jan. 6, 1942 2,360,078Smith Oct. 10, 1944 2,383,727` Lewis Aug. 28, 1945

